[R-sig-hpc] Parallel computation on vectorized function

Brian G. Peterson brian at braverock.com
Sat Aug 27 16:44:47 CEST 2011

On Sat, 2011-08-27 at 07:41 -0700, Megh Dal wrote:
> Dear all, I am looking for some way on how to parallelize some computation on a vectorized function. I have a custom made vectorized function and also have a very length vector (of length some 2 million entries.)
> There are equivalents for all apply family of functions however could not find any way how to apply some parallel computation on a single vectorized function. I have tried with making my vector to list (of same length) and then applying sfLapply() function. However this process is actually taking more time.
> I am using windows vista machine and snowfall package.

take a look at the iterators package, it can chunk up your vector.
 I use it with foreach, but there's no reason you couldn't use it to
chunk something up in snowfall.

Brian G. Peterson
Ph: 773-459-4973
IM: bgpbraverock

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